Searched for: author%3A%22Ueda%2C+J.%22
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Katayama, Y. (author), Kayumi, T. (author), Ueda, J. (author), Dorenbos, P. (author), Viana, B (author), Tanabe, S (author)
In this paper, Mn2+ and Ln3+ (Ln = Eu, Yb) co-doped MgGeO3 phosphors were prepared using a solid state reaction technique, and their optical properties were investigated. Mn2+-doped samples exhibit persistent luminescence in the red region, peaking at 677 nm, because of the 4T1 → 6A1 transition of the Mn2+ ions under ultraviolet (UV) excitation....
journal article 2017
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Ueda, J. (author), Meijerink, Andries (author), Dorenbos, P. (author), bos, A.J.J. (author), Tanabe, Setsuhisa (author)
We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr3+-doped Y3Al5-xGaxO12. Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f2:PJ3 states of Pr3+ and the host conduction band (CB). Temperature-dependent...
journal article 2017
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Ueda, J. (author), Hashimoto, Atsunori (author), Takemura, Shota (author), Ogasawara, Kazuyoshi (author), Dorenbos, P. (author), Tanabe, Setsuhisa (author)
The Y<sub>3</sub>Al<sub>5−x</sub>Ga<sub>x</sub>O<sub>12</sub>(YAGG):Ce<sup>3+</sup>-Cr<sup>3+</sup> persistent phosphor is one of the materials in which Cr<sup>3+</sup> ions act as electron traps. The possibility of electron traps by other transition metal ions (TM<sup>3+</sup>, TM = Sc, Ti, V, Cr, Fe) was investigated and those electron trap...
journal article 2017